package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    //添加购物车
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //只能查询自己的购物车
        shoppingCart.setUserId(BaseContext.getCurrentId());//提前定义好的类
        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() ==1){
            //如果已经存在 就更新数量 数量加一
            shoppingCart = shoppingCartList.get(0);//获取当前物品
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }

        //如果不存在 插入数据 数量就是一

        //判断当前添加到购物车的是菜品还是套餐
        Long dishId = shoppingCartDTO.getDishId();
        if (dishId != null){
            //添加到购物车的是菜品
            Dish dish = dishMapper.getById(dishId);//调用方法获取菜品对象
            //进行填充
            shoppingCart.setName(dish.getName());
            shoppingCart.setImage(dish.getImage());
            shoppingCart.setAmount(dish.getPrice());
        }else {
            //添加到购物车的是套餐
            Setmeal setmeal = setmealMapper.selectById(shoppingCartDTO.getSetmealId());//调用方法获取套餐对象
            //填充套餐
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
        }
        shoppingCart.setNumber(1);
        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartMapper.insert(shoppingCart);
    }

    //查看购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {

        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }


    //清空购物车
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车某个物品
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //判断错误 这是一个购物车不是单个 需要拷贝在进行查询购物车中的数据
        /*Setmeal setmeal = setmealMapper.selectById(shoppingCartDTO.getSetmealId());
        if (setmeal != null){

        }*/
        //首先进行数据拷贝
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置当前用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //获取当前用户操作数据
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断数据
        if (!CollectionUtils.isEmpty(list)){
            shoppingCart =list.get(0);//去除第一条数据就是当前用户操作的数据
            //获取当前购物车中的数量
            Integer number = shoppingCart.getNumber();
            //大于1说明购物车有数据直接减一
            if (number > 1){
                shoppingCart.setNumber(number-1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
            //等于1说明最后一条直接删除就可
            if (number == 1){
                shoppingCartMapper.deletebyId(shoppingCart);
            }
        }

    }
}
